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In this talk I will provide a quick overview on Arctic-midlatitdues climate linkage especially by way of stratosphere-troposphere coupling. Evidence is emerging from both observations and model results that under present climate conditions Arctic sea-ice loss results in modulated propagation of planetary-scale Rossby waves, leading to changes in the strength of polar vortex with consequent surface signals. Having gained some knowledge on this process we are beginning to put various components together for sub-seasonal to sub-decadal prediction, for which sea ice serves as both forcing and an output. In the second part, I will discuss about how this implies in sea ice prediction, in particular in the areas of turbulent heat flux and sea-ice regional variability.